9850
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 18414
- Proper Divisor Sum (Aliquot Sum)
- 8564
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3920
- Möbius Function
- 0
- Radical
- 1970
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 73
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- Pseudoprimes to base 51.at n=34A020179
- Even 10-gonal (or decagonal) numbers.at n=25A028994
- Numbers whose base-3 representation contains no 0's and exactly one 2.at n=38A044990
- Third unsigned column of triangle A051379.at n=5A051561
- The least k such that A063994(k) = Product_{primes p dividing k} gcd(p-1, k-1) = n, or 0 if there's no such k.at n=48A064234
- Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of b.at n=17A096032
- Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of b.at n=21A096032
- Row sums of array A097306.at n=36A097307
- The n-th n-gonal number divisible by n.at n=9A117669
- Decagonal numbers divisible by 10.at n=10A117797
- a(0)=0. a(n) = a(n-1) + (sum of positive integers which are coprime to n, <= n and missing from {a(0),a(1),a(2),..,a(n-1)}).at n=47A122847
- Absolute value of coefficient of x^3 in polynomial whose zeros are 5 consecutive integers starting with the n-th integer.at n=6A127694
- a(n) = A144453(n)/16.at n=49A146537
- The number of homogeneous trisubstituted linear alkanes.at n=24A159938
- Some numbers of the form 2*x^3 + y^3 + z^3 found by a certain algorithm.at n=27A195006
- Sum of the first n binary palindromes; a(n) = Sum_{k=1..n} A006995(k).at n=48A206920
- Number of partitions of n in which any two parts differ by at most 9.at n=36A218511
- Number of foldings of n labeled stamps in which leaf n is inwards.at n=9A223094
- Products of distinct numbers in the Pell sequence (A000129).at n=45A274454
- p-INVERT of (1,1,0,0,0,0,...), where p(S) = 1 - S^5.at n=23A291380